Micro meter-calipers



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MIROMETER CALIPRS. No. 825,238. Patented Sept. l, 1885.

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@No Model.) M M BARNES 2 Sheets--Sheet 2.

MIGROMETER GALIPERS.

No. 325,233. Patented Sept. l, 1885.

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QI-2155555 W 4 v INVENVDR.

. M?. gw M Q Mjw' UNITED STATES PATENT OFFICE.

MERRIOK M. BARNES, OF BOSTON, MASSACHUSETTS.

MiCROMETER-CALIPERS.

SPECIFICATION forming part of Letters Patent No. 325,233, dated September 1, 1885.

(No model.)

To @ZZ whomJ t may concern:

Be it known that I, MERRICK M. BARNEs, of Boston, in the county of Suffolk and State of Massachusetts, a citizen of the United States, haveinvented certain new and useful Improvements in Micrometer Calipers, of which the following is a specification.

My present invention relates to micrometercalipers substantially of the character represented in Letters Patent of mine, No. 271,401, in which a micrometer-caliper is so arranged that it may be moved toward or away from its calipering-anvil.

The object of my present invention is to provide improvements in such devices.

In the drawings, Figure l represents, in elevation and partial section,a device embodying my present improvement; and Fig. 2, a vertical section thereof upon the section-line indicated in Fig. 1. Fig. 3 represents the ob verse of Fig. 1, and shows more fully7 the graduation of the shifting-screw.

In the drawings, H represents an arm carrying a micrometer-calipering device,O D, this arm being so arranged that it may be moved toward or away from another arm, H, carrying the anvil. I obtain this motion of the calipering-arm by mounting it upon a shifting-screw, I, a nut, K, being interposed between the arm H and screw I, so that by turning this nut in either direction the desired motion of the arm may be obtained. The arm is prevented from turning by a tail, h, entering a spline on the screw I, as shown. By regulating the pitch of the screw I, and proper] y graduating it with reference to a Zero mark on the nut K, I obtain a convenient device for measuring the precise distance of motion of the arm H.

It is obvious that the arm H might be itself directly threaded upon the screw I; but this construction would involve swinging the arm around the screw, which is often objectionable.

The calipering device shown at C D represents the form shown in my Letters Patent No. 271,401. It is, however, obvious that other forms of calipering-screw may be substituted for it.

I have also shown and described the graduated shift-ing-screw only as shifting the calipering-screw relatively to a xed anvil. It is obvious that the same screw might be arranged to move the anvil relatively to the calipering-screw, the latter remaining stationary. Such a construction, though practically defective, would, nevertheless, embody my present invention to the extent of employing a graduated shifting screw as a means of altering the field of action of a calipering-serew relatively to its opposed ca1ipering-anvi1,when either is carried by a movable arm operated by said shiftingscrew.

I claim- 1. In a micrometer-caliper of the character herein described, the combination, with the calipering device and its anvil mounted upon standards, either of which is movable relatively to the other, of a graduated shiftingscrew adapted to alter at pleasure the field of action of the calipering-screw relatively to its anvil by shifting one of the said standards, all substantially as herein set forth.

2. A micrometer-caliper having its calipering-screw carried upon a shifting-arm and its calipering-anvil mounted upon a fixed arm and provided with a graduated shifting-screw, whereby the shifting-arm may be moved or shifted a regulated distance toward or away from the fixed arm, all substantially as herein set forth.

8. In a micrometer-caliper, the combination of the fixed arm H', carrying an anvil, the movable arm H, carrying a caliperingscrew, C, the screw I, nut K, and tail h, all substantially as herein set forth.

In testimony whereof I have hereunto subscribed my name this 29th day of January,A. D. 1885.

MERRICK M. BARNES.

Vitnesses:

J. HENRY TAYLOR,

E. B. ToMLiNsoN. 

